Dopamine is commonly known as dopamine hydrochloride for injection, and the commonly used dose is related to the purpose, diuretic vasodilator commonly used 0.5-2ug/(kg.min), cardiotonic commonly used 2-10ug/(kg.min), and elevation of blood pressure commonly used more than 10ug/(kg.min). Depending on the dose, dopamine can excite different receptors and thus produce different effects. Therefore, different dosages are given according to different clinical needs, using micro pumps or controlling the drip rate. 1. Excite DA receptor, dilate renal blood vessels, diuretic: often start from 0.5ug/(kg.min), slowly and gradually increase the dosage to achieve the corresponding therapeutic effect. 2. Excitation of β1 receptor, positive inotropy, cardiotonic: usually start from 2ug/(kg.min), slowly and gradually increase the dose until the corresponding therapeutic effect is achieved. 3. Excitation of α-receptor, vasoconstriction, blood pressure: usually start from 10ug/(kg.min), and slowly and gradually increase the dose until the corresponding therapeutic effect is achieved. 4. In critical cases, the dosage should be increased from 5μg/(kg.min) to 20-50μg/kg.min in rapid increments of 5-10μg/kg.min in order to achieve satisfactory results. Depending on the individual’s constitution, response and condition, the effects achieved by each dose may overlap or cross over, so it should be used under the guidance of a specialized doctor.